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Chapter 2 Dimensionally stable N-PE composite membranes for DMFC applications 3.4. Proton conductivity Figure 4a presents the proton conductivities of N117, N-PE and DE2020 membranes as a function of methanol concentration. The proton conductiv- ity of DE2020 membrane is low in water and then increases reaching a pla- teau at ~7.5x10-2 S/cm. The proton conductivity of the N117 membrane is also high and does not change much up to 6M methanol concentration, but decreases slightly at 10M. The conductivity of the N-PE membrane in- creases with increasing methanol concentration over the measured concen- tration range. However, it is much lower than the N117 and DE2020 mem- branes. Application of resistance in series model indicates that the conduc- tivity of the middle layer (PE+DE2020) determines again the overall N-PE conductivity (see example for the conductivity in ultra pure water in Fig. 4b and Table 1). 10 9 8 7 6 (a) 7 DE2020 6 N117 5 (b) Ultra pure water 54 4 3 2 1 0 N - PE 3 2 1 0 0 2 4 6 8 10 Methanol concentration [M] PE+DE2020 N-PE DE2020 N117 Figure 4. (a) Proton conductivities of N-PE, DE2020 and N117 as a function of methanol con- centration. (b) The proton conductivity of the various membranes in ultra pure water (see de- tails in text and Table 1). 3.5. Single cell performance prediction As we have seen in previous paragraphs, the impregnation of Nafion® into PE support causes a decrease in both methanol cross-over and proton con- ductivity. High proton conductivity and low methanol cross-over is desired to obtain high fuel cell performance. In literature, especially when fuel cell 24 Proton conductivity * (10-2) [S/cm] Proton Conductivity (x10-2 ) [S/cm]PDF Image | Development of membrane materials for direct methanol fuel cells
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